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  • Devices designed to provide temporary ventilation and/or respiratory assistance by delivering an appropriate volume of gas to the respiratory airways. Most ventilators deliver gas to the lungs using positive pressure by means of a mouthpiece, mask, tracheostomy, or an endotracheal tube, but some of them (e.g., tank ventilators) are based on the application of negative pressure to the body surface or chest wall. Ventilators are used in patients who cannot breathe on their own or who require assistance to maintain adequate ventilation because of illness, trauma, congenital defects, or drugs including anesthetics.
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